Brad Haddin believes Australia still have plenty of work to do if they are going to open up a 2-0 lead in the Ashes.
Australia look to be in a strong position after day two of the second Test in Adelaide after Haddin and Clarke scored centuries.
Haddin finished with 118, while Clarke weighed in with 148 as Australia declared on 570-9.
The hosts then struck late in the day to remove England captain Alastair Cook to leave the hosts in trouble on 35-1.
However Haddin insists it is now the job of the Australia attack to ram home their advantage.
"It was important that we batted big in this first innings," Haddin told Sky Sports.
"We are happy where the game sits at the moment but there is a lot to do over the next couple of days.
"It is a pretty good batting wicket so our bowlers have got a big job to do."
Although the drop-in pitch at the Adelaide Oval definitely appears to favour the batsmen, Haddin claims the likes of Mitchell Johnson, Ryan Harris, Peter Siddle and Nathan Lyon can still get something out of it to trouble England.
"We've got to have a good look at it in the morning but we've probably got to get a fraction fuller and have a couple of catchers in front of the eyes of the batters," he added.
"There is still enough there, we think, if you can get full while Nathan started to get it to turn today."